# Measuring Angles Using A Protractor

# Protractor

**Ruler part :**

**Vertex or Center of protractor:**

**Outer and inner Number Scale**

# How to Measure Angles

# Let's measure once more from the other side of the angle.

# How to measure reflex angle ?

## Here's how:

# Why Do We Measure Angles in 360 Degrees?

The measurement of angles in degrees is based on historical and practical reasons. Here are some insights on this topic.

**Historical Origins: **The ancient Babylonian civilization divided the year into 360 days. This was based on their observational astronomical data to estimate the duration of a year. The number 360 became a foundation for circular motions and cycles. Therefore, defining a full rotation of a circle as 360 degrees has its roots in this historical context.

**Mathematical Convenience: **360 is a number divisible by many prime factors (e.g., 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, 360). This makes angle measurements and calculations related to circles easier.

**Astronomical Observations:** Ancient civilizations tried to measure time by observing the movements of stars and other celestial bodies in the sky. These observations contributed to the development of concepts related to circular motions and cycles.

**Standardization:** Over time, the 360-degree system became an international standard, ensuring that angle measurements in science, engineering, and daily life are consistent and understandable.

For these reasons, a full rotation is accepted as 360 degrees, and this has become a universal standard for measuring angles.

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